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4.For better air,it makes sense to prevent people from driving on certain days.

分析 为了更好的空气,阻止人们在某些日子开车是有意义的.

解答 答案:prevent.prevent sb.from doing sth.阻止某人做某事,根据句意,阻止人们某些日子开车对更好的空气质量是有好处,有意义的,故为prevent.

点评 本题考查prevent sb.from doing sth.的固定搭配.

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